US hosts anti-extremism summit after global terror attacks US has opened a three-day summit on countering violent extremism. Representatives from around the world are attending the gathering. This follows shooting incidents in Denmark, France and Australia. Vice President Joe Biden says countries need to provide a sense of belonging that discredits the terrorist's appeal to fear, isolation, hatred and resentment. The White House believes Europe is especially susceptible to terror attacks because immigrants there are often less well integrated into society. BBC